How did increasing the snakes affect the grass

I dont understand this question but i will try my best

Explanation:

By increasing the population of the snakes, the size of the grass also increased because there were fewer rabbits, meaning that the snakes and hawks were eating more of the rabbits. With fewer rabbits, less of the grass got eaten.

yellow fever and other tropical diseases

health care plans in the united states having high costs because they are focusing on providing quality programs for different groups of individuals. the quality of the service is based on money flow received from the members. without this investment, couldn't be possible a constant scientific searching to prevent death and illness caused because of low levels of health investigation. currently, the complaints are not about the highest cost, but about the coverage and benefits to access the necessary health services required by the members.  

besides, if a global health system is established the quality levels will fall down because of the standardized of the health. the access to care will increase but the quality will be low because it depends on the money invested.